What kinda vanes? I have heard that the NAP Quick Spins do not do well thru a biscuit.
If you are fletching your own shafts, try lightly sanding the tail of the shaft with a very fine sandpaper, say 400 grit. That will help the vanes hold on.
I am using the 2" Bohning Blazers on Easton's ST Axis shafts. The Blazers seem to work well with the biscuit.
Take a kid with you. Show them the Great Outdoors. Pass it on.